Air-return grill for a refrigeration system



FIG. 1 is an enlarged portion of a front perspective view of an air-return grill for a refrigeration system taken from the FIG. 7 perspective view showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a right end view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a front perspective view of an air-return grill for a refrigeration system.

The broken lines shown in the drawings represent reference cutoff lines to show portions of the claimed design and form not part of the claimed design. 

CLAIM The ornamental design for “air-return grill for a refrigeration system,” as shown and described. 